The families of two Dallas police officers killed in the line of duty in July have received a welcomed gift this holiday season.

The Stephen Siller Tunnels to Towers Foundation, a nonprofit organization based in New York, announced Monday that it has raised enough money to pay off the mortgages of the families of Sgt. Michael Smith and Dart Officer Brent Thompson.

Smith and Thompson were among the five Dallas police officers killed in an ambush this past summer.

Tunnels to Towers has also raised money for the families of the other slain officers. The organization, founded in the memory of 9/11 firefighter Stephen Siller, said it raised $610,000 in five days to assist these families.

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